bug 347826138 clean up the deprecated region attribute custom_attribte_filter_multi_attributes

[gotochkin]

Description

The new region tag has been previously added and updated in the documentation. The old region tag can be now removed.

bug 347826138

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Checklist

• [x] I have followed Sample Format Guide
• [ ] pom.xml parent set to latest shared-configuration
• [x] Appropriate changes to README are included in PR
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [x] Tests pass: mvn clean verify required
• [x] Lint passes: mvn -P lint checkstyle:check required
• [ ] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [x] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 1 region tag.

- [jobs/v3/src/main/java/com/google/samples/CustomAttributeSample.java:151](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/c4cc5541365b8ca232ad62bb8e4ec3b20448cf15/jobs/v3/src/main/java/com/google/samples/CustomAttributeSample.java#L151), tag `custom_attribute_filter_multi_attributes`

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[iennae]

confirmed that it's been updated for java. still in use for python and go which is why snippet-bot check is complaining.